JPS6117978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a safety device for a cargo handling operation member in a cargo handling vehicle such as a shovel loader or a lift truck.

Conventionally, in the case of a cargo handling vehicle such as a four-wheel drive compact shovel loader S, as shown in FIG.
The device is always connected to the operating pedal (cargo handling operating member) D provided in front of the driver's seat C via a link mechanism, and the lift arm A is actuated via the lift cylinder B by depressing the operating pedal D. It was hot. For this reason, the operator must use the shovel loader S.
When descending from the vehicle, there was a risk that if the operator accidentally pressed the operating pedal D, the lift arm A would descend, causing an accident. In order to prevent this danger, a stopper pin F was provided on the outer surface of the upper end of the head guard E to stop the lowering of the lift arm A. However, this stopper pin F is held in a recessed state against the outer surface of the head guard E by removing the clasp. It is not something that automatically appears and disappears, and if an operator forgets to remove the latches in advance when getting off the shovel loader S, there is a risk of an accident.

In view of the above-mentioned drawbacks of the conventional art, the present invention has been developed to open a safety bar that is openable and closable at the lift entrance of a cargo handling vehicle, thereby removing a part of the link mechanism that connects the oil control valve and the cargo handling operation member. It is an object of the present invention to provide a safety device for a cargo handling operation member in a cargo handling vehicle that can be detached via a cable and prevent accidents caused by the lowering of a cargo handling section when getting off the vehicle.

An embodiment of the present invention will be described below with reference to a drawing based on a four-wheel drive compact shovel loader. In the drawing, 1 is a body frame, 2 is a floor,
Reference numerals 3 and 4 refer to the left and right columns forming the front column of the head guard E, 5 and 5 indicate travel control levers, and 6 and 7 indicate load handling operation pedals.
is the cargo handling operation pedal that operates the cylinder for the bucket attached to the tip of lift arm A, and the pedal 7 on the left side is the lift cylinder B for lift arm A.
This is a cargo handling operation pedal that operates. As shown in FIG. 3, this operating pedal 7 is rotatably attached to a bracket 8 fixed to the upper surface of the floor 2 about a pin 9. In this embodiment, the cargo handling operation member is based on an operation pedal provided on the floor, but the pedal type may be replaced with an operation lever commonly used in lift trucks and the like.

Next, the link mechanism 12 connecting the operating pedal 7 and the lift spool 11 of the oil control valve 10 will be explained.
A link rod 14 is pivotally attached to the front end of the back surface of the floor 2. A link lever 17 is a dogleg-shaped link lever that connects the link rod 13 and a swinging link 22, which will be described later.
It is rotatably mounted around a shaft 16 supported via a bracket 15 fixed to the back surface. This link lever 17 has a first lever piece 18 and a second lever piece 19 whose base end is fixed to the shaft 16, and the tip of the first lever piece 18 is connected 20 to the lower end of the link rod 13. . Further, at the tip of the second lever piece 19, there is a swing link 22 which will be described below.
A connecting pin 21 is provided to protrude and engage with.

Reference numeral 22 denotes a triangular swinging link that connects the second lever piece 19 of the link lever 17 and the lift spool 11 of the oil control valve 10, one end of which is pivotally attached 25 to the tip of the lift spool 11. A connecting groove 23 having a vertical arc shape centered on the pivot point 25 is formed in the middle part of the swing link 22, and is continuous with the lower end of the groove 23, and the link 22 is rotated upward. When the open groove part 24, which has a horizontal arc shape centered on the shaft 16, is provided in a V-shape as shown in FIG. 3, and the pin 21 is engaged with the connecting groove part 23. The movement of the second lever piece 19 is transmitted to the lift spool 11 via the swing link 22, but when it is located in the release groove 24, the rotation locus of the second lever piece 19 and the groove are 24, the movement of the lever piece 19 is not transmitted to the lift spool 1.

The above-described rotation of the swing link 22 about the pivot shaft 25, in other words, the displacement operation of the pin 21 protruding from the second lever piece 19 into both grooves 23 and 24 is inevitably released when getting off the vehicle. This can be done automatically via a push-pull cable (hereinafter simply referred to as a cable) 34 connected to a safety bar 27 provided in this manner.

The safety bar 27 is installed so as to be openable and closable between the left and right supports 3 and 4 of the head guard E, which forms the entrance for the shovel loader S, as shown in FIG. The left end of this safety bar 27 is attached to the left column 3 so that it can be opened and closed about a pin 26, and the right end of the safety bar 27 is attached to the left column 3, which is attached to the inner surface of the right column 4. Locking hole 4A
A locking pin 28 is interposed which is removably fitted into the locking pin 28 . As shown in FIGS. 5 and 6, this locking pin 28 is biased toward the right column 4 by a spring 29, and is also biased by a lever 30 interposed in the pipe of the safety bar 27. An escape operation is forcibly performed on the locking hole 4A. Note that one end of the lever 30 is fixed to the locking pin 28, and the lever 30
The other end of the safety bar 27 protrudes movably into a horizontally elongated guide hole 27A extending through the outer peripheral side surface of the safety bar 27.

Reference numeral 31 denotes a bottomed box-shaped holding member fixed to the inner surface of the right column 4, and the right end of the safety bar 27 in the figure is fitted into the side surface at a position facing the locking hole 4A. A U-shaped notch hole 32 is formed, and the safety bar 2 is inserted into this notch hole 32.
7 are fitted, the locking pin 28 protruding from the safety bar 27 is fitted into the locking hole 4A. Further, an interlocking piece 33, which will be described later, is fitted into the holding member 31 so as to be movable up and down.

34 is a cable that rotates the swing link 22 upward when the safety bar 27 is removed from the holding member 31, and one end of the outer cable 35 is connected to the cylindrical portion 17A of the link lever 17 as shown in FIG.
The outer cable 35 is fixed to the outer circumferential surface via a fixing member 37, and the other end of the outer cable 35 is fixed to the inner surface of the right column 4 located below the holding member 31 as shown in FIG. It is fixed via member 38. One end 36A of the inner cable 36 inserted into the outer cable 35 is connected to the tip of the swing link 22, and the other end 36B passes through the bottom surface of the holding member 31 and is connected to the interlocking piece 33, respectively. The interlocking piece 33 is pressed by the safety bar 27 and moved downward along the holding member 31, and is always urged upward via the spring 39.

Subsequently, the operation of the embodiment configured as described above will be explained.

First, when the safety bar 27 is horizontally suspended between both supports 3 and 4 to close the elevator door, the interlocking piece 33 is held downward against the biasing force of the spring 29, as shown in FIG. One end 36A of 36 is pushed out in the direction of arrow P in the figure, as shown in FIG. Then, the swing link 22 swings downward around the pivot 25, and the connection groove 23 of the link 22 engages with the connection pin 21 of the second bar piece 19, and the swing link 22 and the second lever The piece 19 is now in a substantially connected state. In this state, when the operating pedal 7 is depressed to each position of the ascending operation 7A and descending operation 7B shown by the chain line in FIG.
The lift spool 11 of the oil control valve 10 is operated via the lift arm A to move up and down.

Now, when exiting the vehicle with the lift arm A raised, when the safety bar 27 that closes the entrance is released, the restraint of the interlocking piece 33 is released as shown in FIG. 29, and one end 36A of the inner cable 36
As shown in the figure, it is pulled in the direction of arrow Q in the figure. Then, the swing link 22 is swung upward about the pivot 25, and the release groove 24 of the link 22 moves to a position corresponding to the connecting pin 21 of the second lever piece 19, and the second lever piece 19 The restraint between the swing link 22 and the swing link 22 is released. In this state, even if the operation pedal 7 is depressed to the lowering operation side position 7B as indicated by the chain line in FIG. Therefore, no moving force is generated to the lift spool 11, and the lift arm A in the raised position is not moved down.

Next, another example of the present invention will be explained.

Regarding another example (a), in the above embodiment, the link lever 17
The second lever piece 19 of the link lever 17 is provided with a connecting pin 21, and the swing link 22 is provided with a connecting groove 23 and a release groove 24. As shown in FIG. 23 and the release groove 24 are provided in an inverted V shape as shown in the figure, and the swing link 22
A connecting pin 21 may be provided to connect the second lever piece 19 and the swing link 22 in a detachable manner.

Regarding another example (b), as another example in which a part of the connecting portion of the link mechanism 12 is detachably connected, as shown in FIGS. 8 and 9, the first lever piece 1 of the link lever 117
18 and a second lever piece 119 are provided separately to the shaft 116 rotatably supported by the bracket, and while the first lever piece 118 is fixed to the shaft 116, the second lever piece 119 and the shaft 116 are may be detachably connected via a connecting pin 40 as shown in FIG. And this connecting pin 40
is connected to one end 136A of the inner cable 136 of the cable 134. Furthermore, contrary to the above, the second
The lever piece 119 may be fixed to the shaft 116, and the first lever piece 118 and the shaft 116 may be removably connected via the connecting pin 40.

Regarding another example (c), as shown in FIGS. 10 and 11, a U-shaped connecting groove 41 is formed at the tip of the second lever piece 219 of the link lever 217 that rotates around the shaft 216, A swing link 222 having a connecting pin 42 that removably engages with the connecting groove 41 is attached to the wrist spool 11 of the oil control valve 10.
It may be pivoted to. Then, connect the tip of the swing link 222 to the inner cable 236 of the cable 234.
is connected to one end 236A of. However, in this case, when the safety bar is opened, one end 236A of the inner cable 236 is pushed out by the spring means as shown in FIG. 11.

As mentioned above, this invention enables a part of the link mechanism that connects the oil control valve of the lift cylinder that operates the lift arm of the cargo handling vehicle and the cargo handling operation member located in the driver's seat to be detachable. A safety bar for opening and closing the doorway is installed between the left and right supports of the doorway of the cargo handling vehicle so that the doorway can be opened and closed using one end thereof as a fulcrum, and when the safety bar is opened, the link mechanism In a cargo handling vehicle, the safety bar and the disconnection connection part are connected by a cable so that when the safety bar is disconnected and the safety bar is closed, the connection connection part is connected. This is a safety device for cargo handling operation members.

Therefore, when getting off the loading/unloading vehicle from the entrance/exit, the safety bar installed between the left and right supports of the opening/exit is released, and the connecting/disengaging portion of the link mechanism is disengaged. Even if a malfunction occurs, the lift arm in the raised state will not be lowered, and accidents caused by lowering of the soft arm can be reliably prevented.

Furthermore, when operating the cargo handling vehicle, the elevator door is closed with a safety bar, thereby connecting the connecting/disengaging portion of the link mechanism and ensuring the safety of the worker while boarding the cargo handling vehicle. The effect is that it can be secured.

[Brief explanation of the drawing]

FIG. 1 of the drawings is a side view schematically showing a conventional device. 2 to 6 show one embodiment of the present invention, in which FIG. 2 is a perspective view of the shovel loader seen from behind the driver's seat, FIG. 3 is a side view showing the connected state of the link mechanism, and FIG. The figure is a side view showing a state in which a part of the link mechanism is removed, FIG. 5 is a cross-sectional view showing the movable rod in a closed state, FIG. The figures show other examples of the present invention, and FIG. 7 is a side view of another example (a), and FIG.
Figures 9 and 9 are perspective views and sectional views of another example (b).
0 and 11 are perspective views of another example (c). 1...Body frame, 2...Floor, 5...
Traveling lever, 5A...Gripping portion, 7...Operation pedal, 10...Oil control valve, 11...
...Lift spool, 12...Link mechanism, 13...
... Link rod, 17 ... Link lever, 18 ... First lever piece, 19 ... Second lever piece, 22 ... Swing link, 23 ... Connection hole, 24 ... Release hole, 2
7... Safety bar, 34... Cable, 35... Outer cable, 36... Inner cable, S...
Shovel loader, A...Lift arm, B...Lift cylinder, C...Driver's seat, E...Head guard.

Claims (1)

[Scope of Claims] 1. A part of a link mechanism that connects an oil control valve of a lift cylinder that operates a lift arm of a cargo handling vehicle and a cargo handling operation member disposed in a driver's seat is removably connected, A safety bar for opening and closing the doorway is installed between the left and right supports of the cargo handling vehicle's doorway so that the doorway can be opened and closed using its one end as a fulcrum, and when the safety bar is opened, the link mechanism is engaged and disengaged. A cargo handling operation member for a cargo handling vehicle, in which the safety bar and the disconnection connection part are connected by a cable so that the connection part is connected when the connection part is detached and the safety bar is closed. safety equipment. 2. One end of the cable is connected to the connecting part of the link mechanism, and the cable is always urged in the direction of detachment of the connecting part by the spring means, and the other end of the cable is connected to the opening/closing part of the safety bar. When the safety bar is closed, the opening/closing tip of the safety bar allows the cable to resist the biasing force of the spring means to connect the detachable connection part. A safety device for a cargo handling operation member in a cargo handling vehicle according to claim 1, which is configured to be operated in a direction.